An additioal option in the settings screen allows for a Joystick Look Spring.
Whilst in flight mode, enabling look spring will let your joystick control the position of the firing point in a analogue way so that each movement extent is in relation to the screen. The alternative is for joystick movement to directionally move the cursor. This mode is only advisable for real joysticks rather than gamepads.
Enabling look spring will stop your mouse movement from functioning whilst in flight mode.